Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d61c58148ec5c5…

MALICIOUS

PDF

90.8 KB Created: 2021-03-15 16:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b10b6b1bade37305f6e4aedfa60d15 SHA-1: d02fff72d79ec5aa5680aeaf68924091b8ca8642 SHA-256: 56d61c58148ec5c5b600fdcb53c9196f76f8b6d752ed5a81e3b7b53fc3682b7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are disguised as educational content, indicating a link farm or phishing lure. The presence of multiple suspicious URLs and a high ML classifier score strongly suggests malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=hindi+english+alphabet+pdf
    • http://trells.space/how_to_print_mcgraw_hill_connect_ebook_redditamx77.pdf
    • https://cdn.sqhk.co/merojuniv/jcljNhc/class_9_science_notes_chapter_2_biology.pdf
    • https://cdn.sqhk.co/tinupolureg/ihjiP6x/hay_day_popcorn_topf.pdf
    • https://cdn.sqhk.co/wetabupi/uiidjcr/18755263579.pdf
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/b32cf1b214ebd7.pdf
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/6596c0.pdf
    • https://cdn.sqhk.co/vaxarogajib/goT6VlI/mimokopibaxukilolu.pdf
    • https://cdn.sqhk.co/xaripisi/hhfwh1Y/73589583686.pdf
    • http://ultra0.space/partition_piano_paris_seychellesvyv13.pdf
    • https://cdn.sqhk.co/wefopijupe/dYRgihe/84422775502.pdf
    • http://loginwithfb.site/acer_aspire_e_15_e5-575-33bm_max_ramf3q1z.pdf
    • https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/be22afafe267.pdf
    • https://cdn.sqhk.co/gorokipo/gjjIEGC/star_wars_vr_secrets_of_the_empire_review.pdf
    • https://cdn.sqhk.co/xusarukave/BAtge3U/50154443880.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://wefazerigibu.epizy.com/26190295347.pdf
    • http://vamanufa.rf.gd/how_much_does_computer_hardware_engineer_make.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6f.bin
5552c89c97975203b6dc7e015fcad2e0fae8887b0bce5d0b04e91b8290b13cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 5308 bytes
font_01_sfnt_off00011079.bin
49567974dcdbcfe08f89bb253360cc707c06e6d20d5bc4cc2406a151d9994ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 13480 bytes
font_02_sfnt_off00013ad7.bin
7f3837143124cafa2d9e9b4eb22fe4dbdb247feed2f456a810229a7dda5bc219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 11744 bytes

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